This is not a competitive challenge. It's just a bit of fun. I'm sure that a lot of us have favourite subjects. The idea of this thread, and future ones, is to nominate a subject, that some of us may not have photographed, with the challenge of finding and photographing that subject.

Think of it like geocaching for photographs.

So, onto the challenge. Everyone post a single picture of a helicopter. If you haven't got one, then the challenge is to find and photograph one. If you can't find a full size one, then you'll have to get creative.